'London Whale' Rattles Debt Market

By

Gregory Zuckerman And

Katy Burne

Updated April 6, 2012 1:19 p.m. ET

In recent weeks, hedge funds and other investors have been puzzled by unusual movements in some credit markets, and have been buzzing about the identity of a deep-pocketed trader dubbed "the London whale."

That trader, according to people familiar with the matter, is a low-profile, French-born J.P. Morgan Chase & Co. employee named Bruno Michel Iksil.